These sites have lotsa ska stuff to be bought.
Good British CD site with lots of ska
Crispy's House O Ska poster store at Allposters.com
Angry, Young, and Poor (Mostly Punk, but with some decent ska stuff) CD Baby's Ska Page Copasetic Mail Order Daddy Kool Records D.I.Y. Records Dr. Strange Interpunk Know Your Product Ska, Punk, Oi!, and more. Lotsa stuff. Labelrecord.com's ska selections Manfred Rude Mailorder Mordros Music NexTag.com's Ska listings Panik mail order Reggae Revive (German Only) RevHQ Indie Music Store Selekta Shop (German only) Ska T Boy Discs Songsearch CD store's Ska listing Sonic Rendezvous' ska page Subsociety (French) UK Reggae (auctions or ska, rocksteady and reggae LPs and 7")